Why not just tell your wife? Having a girlfriend and not telling her is one thing. But being in a major committment with a significant other is another. What you do impacts not just you, but also your wife, financially, pyschologically, and physically. Why don't you present her with some positives about steroids and maybe show her the HBO specials on them. I know its easier siad than done, but I would reconsider hiding it from her. Just my 2 cents.